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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-10-2009, 03:08 PM   #1
acewin
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oil sucking machine

Hope someone can help....
My 2001 325i is sucking back a liter of oil every 1000kms and has been doing so for about 9 months. It has 190 000 km but otherwise runs great.
HELP!!!!!!
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Old 07-10-2009, 04:53 PM   #2
DBear
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Check your valve cover gasket. If its' never been replaced might be the primary source for the leak. Mine was leaking at the back and replacing significantly reduced the amount of oil loss. The rest I chalk up to mileage on my engine.
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Old 07-10-2009, 07:25 PM   #3
acewin
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thanks I'll check it out
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Old 07-10-2009, 07:27 PM   #4
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Ccv
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Old 07-10-2009, 10:03 PM   #5
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Originally Posted by DBear View Post
Check your valve cover gasket. If its' never been replaced might be the primary source for the leak. Mine was leaking at the back and replacing significantly reduced the amount of oil loss. The rest I chalk up to mileage on my engine.
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Old 07-11-2009, 12:26 AM   #6
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my car eats up the oil too. More like 1 quart per 2000 miles. Still more than I'd like.
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Old 07-11-2009, 01:58 AM   #7
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my car only eats oil in the summer time.
it eats oil like its going out of style lol
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Old 07-11-2009, 02:01 AM   #8
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my car only eats oil in the summer time.
it eats oil like its going out of style lol
do you use different oils for summer and winter?
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Old 07-11-2009, 02:53 AM   #9
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do you use different oils for summer and winter?
the same oil from the dealership. but now since u mentioned it maybe it would be a good idea....
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Old 07-11-2009, 03:04 AM   #10
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the same oil from the dealership. but now since u mentioned it maybe it would be a good idea....
I was actually thinking that could be the reason but now that I think about it using a thicker oil in summer might stop the leak
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Old 07-11-2009, 03:10 AM   #11
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Crankcase gas oil-vapor separator can cause large amounts of oil consumption.

For emissions and performance reasons, gas is sucked out of the crankcase into the intake manifold. Sometimes a little bit of oil gets sucked up into this crankcase vent as well. The E46 has a pretty complex setup that makes sure the vacuum for this crankcase vent is consistent, as well as separates oil from the vapor. Vapor goes into intake manifold and gets burned in the engine, oil drains down and empties into the side of the oil dipstick. With something rather complex like this, it can fail, and oil gets sucked into the engine.

Have you noticed an occasional puff of bluish smoke when starting your car?
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Old 07-11-2009, 09:48 AM   #12
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Crankcase gas oil-vapor separator can cause large amounts of oil consumption.

For emissions and performance reasons, gas is sucked out of the crankcase into the intake manifold. Sometimes a little bit of oil gets sucked up into this crankcase vent as well. The E46 has a pretty complex setup that makes sure the vacuum for this crankcase vent is consistent, as well as separates oil from the vapor. Vapor goes into intake manifold and gets burned in the engine, oil drains down and empties into the side of the oil dipstick. With something rather complex like this, it can fail, and oil gets sucked into the engine.

Have you noticed an occasional puff of bluish smoke when starting your car?
I was loosing about a quart every 1k miles but after replacing valve cover gasket and CCV my oil loss has been reduced significantly. The CCV in particular had the most dramatic influence on my car's performance. Idle is smoother and some of my vacuum gremlins have disappeared.
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Old 07-11-2009, 10:48 AM   #13
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I used to burn oil, about a quart every 1000 miles. Also noticed a huge increase in Vanos rattle. I was running the OEM 5w-30. Then I switched to Lubro Moly 10w-40 Semi Synthetic (I know, I'm not planning on running it more than 5k miles). Since then, I've noticed almost no vanos rattle, higher oil pressure up top, and almost no oil consumption.
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Old 07-11-2009, 01:33 PM   #14
acewin
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thanks guys .... whats the cost on CCV replacement
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Old 07-11-2009, 03:32 PM   #15
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thanks guys .... whats the cost on CCV replacement
My indie charged me $500US parts and labor (parts are around $100 alone). Some people opt to DIY but from the many threads I've read its no picnic. A lot of items to remove. No special tools required. Just tedious.
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Old 07-11-2009, 04:17 PM   #16
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I used to burn oil, about a quart every 1000 miles. Also noticed a huge increase in Vanos rattle. I was running the OEM 5w-30. Then I switched to Lubro Moly 10w-40 Semi Synthetic (I know, I'm not planning on running it more than 5k miles). Since then, I've noticed almost no vanos rattle, higher oil pressure up top, and almost no oil consumption.
Running a thicker oil really just covers up problems. I'd look into a Dr. Vanos kit and diagnose the low oil pressure and consumption.

Also, FWIW, M1 0w-40 is also substantially thicker at all temps than BMW oil. Might want to give it a try. I think it would be a more reasonable alternative than a 10w-40 blend.
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Old 07-11-2009, 04:28 PM   #17
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Granted, I have a newer model E46, 2004....never have to add ANY oil to it between the 3500 mile oil changes. Does the same with either Valvoline or Mobil 1 synthetic. Car only has about 75K miles on it though.
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Old 07-11-2009, 06:54 PM   #18
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thanks DBEAR. I think I will bite the bullet and pay
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Old 07-12-2009, 01:33 AM   #19
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Quote:
Originally Posted by jeffro3000 View Post
Running a thicker oil really just covers up problems. I'd look into a Dr. Vanos kit and diagnose the low oil pressure and consumption.

Also, FWIW, M1 0w-40 is also substantially thicker at all temps than BMW oil. Might want to give it a try. I think it would be a more reasonable alternative than a 10w-40 blend.
I'll look in to the M1 0w-40. But, before I try that, I'm going to try the Lubro Moly 5w-40 Full Synthetic as I can get it cheaper than M1. I don't really have an oil comsuption issue, its just in the summer time when it gets hot (100+) and the BMW 5-30 just is too thin that I have this issue. I also tend to drive the car hard a fair bit.
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Old 07-12-2009, 10:10 AM   #20
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Originally Posted by jeffro3000 View Post

Also, FWIW, M1 0w-40 is also substantially thicker at all temps than BMW oil. Might want to give it a try.
Not true. 0W-40 is heavier than BMW oil (5W-30) at operating temperatures, but lighter at cold temperatures.
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